hmm.. I live in the southbay. And as far as i can tell, I don't think anyone sell Artic Silver...
You can try Pixel USA in SJ and Astek or one of thost Fremont stores.
Oh, also you might want to check out the Foothill Flea Market every 2nd satuarday of the month.. this flea market kicks A$$ man! I go there everymonth, all electronic stuff, get there by about 7 or so, and just browse around, one of these days people are gonna have a case of artic silvr there for dirt cheap. It's at the foothill college parking lot.